1 files changed, 60 insertions, 0 deletions
diff --git a/tests/run/builtin_types_class.py b/tests/run/builtin_types_class.py
new file mode 100644
index 000000000..f09be80f4
--- /dev/null
+++ b/tests/run/builtin_types_class.py
@@ -0,0 +1,60 @@
+# mode: run
+
+from __future__ import print_function
+
+import cython
+
+# https://github.com/cython/cython/issues/3954
+# calls to the __class__ attributes of builtin types were optimized to something invalid
+
+@cython.locals(d=dict)
+def test_dict(d):
+    """
+    >>> test_dict({})
+    dict
+    {}
+    """
+    print(d.__class__.__name__)
+    print(d.__class__())
+
+@cython.locals(i=int)
+def test_int(i):
+    """
+    >>> test_int(0)
+    int
+    0
+    """
+    print(i.__class__.__name__)
+    print(i.__class__())
+
+@cython.cclass
+class C:
+    def __str__(self):
+        return "I'm a C object"
+
+@cython.locals(c=C)
+def test_cdef_class(c):
+    """
+    # This wasn't actually broken but is worth testing anyway
+    >>> test_cdef_class(C())
+    C
+    I'm a C object
+    """
+    print(c.__class__.__name__)
+    print(c.__class__())
+
+@cython.locals(d=object)
+def test_object(o):
+    """
+    >>> test_object({})
+    dict
+    {}
+    >>> test_object(1)
+    int
+    0
+    >>> test_object(C())
+    C
+    I'm a C object
+    """
+    print(o.__class__.__name__)
+    print(o.__class__())